Theta Vacua and Boundary Conditions of the Schwinger-Dyson Equations

  title={Theta Vacua and Boundary Conditions of the Schwinger-Dyson Equations},
  author={Santiago Gar{\'c}ıa and Zachary Guralnik and Gerald S. Guralnik},
Quantum field theories and Matrix models have a far richer solution set than is normally considered, due to the many boundary conditions which must be set to specify a solution of the Schwinger-Dyson equations. The complete set of solutions of these equations is obtained by generalizing the path integral to include sums over various inequivalent contours of integration in the complex plane. We discuss the importance of these exotic solutions. While naively the complex contours seem perverse… CONTINUE READING

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